1. Infectious Diseases Unit, G. Gaslini Children's Hospital, Genoa, Italy
2. Bone Marrow Transplant Unit, G. Gaslini Children's Hospital, Genoa, Italy
3. Laboratory of Hematology, Department of Hematology and Oncology
4. Blood Bank and Transfusional Service, G. Gaslini Children's Hospital, Genoa, Italy